I have no idea what's going on.
I understand you had the presets but, then they have suddenly vanished.
This surely is not right, and have to be investigated.
But to maybe solve your issue, have you tried to reinstall Synclavier V?
If needed you can find a download here if you wan't to try it:
https://www.arturia.com/support/updates&manualsPerhaps it's best if you uninstall the Synclavier you have first. Don't know. For you to decide.
Perhaps Arturia will answer here, else you also can contact Arturia support, if you need to.